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  • Calculate aluminium thickness?

    Discussion in 'Calculations' started by kenny82, Jun 16, 2010.

    1. kenny82

      kenny82 Well-Known Member

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      OK guys can you help? I have a bracket made out of 5mm mild steel. to get the same stiffness how thick would it need to be if I made it from aluminium?? Duh basic stuff probably but I'm not sure how to calculate,
      Thanks :) :) :oops: :oops:
       
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    3. ConnectUTS

      ConnectUTS Active Member

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      Re: calculate aluminium thickness??

      Remember that the bending a beam is a function of the moment of inertia of the beam. For a retangular beam

      I = H^3 * W

      Is the thickness change in the direction of the load or perpendicular to the load.

      If the thickness change is in the direction of the load the

      H(A) = (E(S)/E(A))^3 * H(S)

      Where

      H(A) or W(A)= the thickness of the Aluminum
      H(S) or W(S) = the thickness of the Steel
      E(A) = elastic modulus of the aluminum
      E(S) = elastic modulus of the steel

      If the thickness change is perpendicular to the load then the equation is

      W(A) = (E(S)/E(A)) * W(S)
       
    4. donnole

      donnole New Member

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      Re: calculate aluminium thickness??

      Moment of inertia of a rectangular beam is 1/12 x b x h^3 "h" is the direction in line with your load. Clearly, you get a lot more bang for your buck by increasing h, because you're cubing that number. Think of joists in your home, or I-beams.
       
    5. rushinpatel

      rushinpatel Active Member

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      Re: calculate aluminium thickness??

      if u compare aluminium and steel result is aluminium having a high ductility but law compressive strength where as in steel this property are reverse manner so obvious that aluminium bracket required more thickness compared to steel,

      during bracket manufacturing some bending effect are occurred on face area of bracket

      Remember that the bending a beam is a function of the moment of inertia of the beam. For a retangular beam

      I = H^3 * W

      Is the thickness change in the direction of the load or perpendicular to the load.

      If the thickness change is in the direction of the load the

      H(A) = (E(S)/E(A))^3 * H(S)

      Where

      H(A) or W(A)= the thickness of the Aluminum
      H(S) or W(S) = the thickness of the Steel
      E(A) = elastic modulus of the aluminum
      E(S) = elastic modulus of the steel

      If the thickness change is perpendicular to the load then the equation is

      W(A) = (E(S)/E(A)) * W(S)
       
    6. mba motorsport

      mba motorsport Member

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      Re: calculate aluminium thickness??

      You can also change the design of the bracket by including say a bird beak in the corner to stiffen up the bracket which will allow you to reduce the thickness of it when made from ally.

      Geoff
       
    7. srdfmc

      srdfmc Well-Known Member

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      basically if you need a simple rule of thumb use a X2 factor btw mild steel thickness and Al

      regards,

      PS:" basically" rarely makes the optimum solution :D
       

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